Struct rand_core::block::BlockRng64

source ·
pub struct BlockRng64<R: BlockRngCore + ?Sized> {
    pub core: R,
    /* private fields */
}
Expand description

A wrapper type implementing RngCore for some type implementing BlockRngCore with u64 array buffer; i.e. this can be used to implement a full RNG from just a generate function.

This is similar to BlockRng, but specialized for algorithms that operate on u64 values.

No whole generated u64 values are thrown away and all values are consumed in-order. next_u64 simply takes the next available u64 value. next_u32 is however a bit special: half of a u64 is consumed, leaving the other half in the buffer. If the next function called is next_u32 then the other half is then consumed, however both next_u64 and fill_bytes discard the rest of any half-consumed u64s when called.

fill_bytes and try_fill_bytes consume a whole number of u64 values. If the requested length is not a multiple of 8, some bytes will be discarded.

Fields§

§core: R

The core part of the RNG, implementing the generate function.

Implementations§

source§

impl<R: BlockRngCore> BlockRng64<R>

source

pub fn new(core: R) -> BlockRng64<R>

Create a new BlockRng from an existing RNG implementing BlockRngCore. Results will be generated on first use.

source

pub fn index(&self) -> usize

Get the index into the result buffer.

If this is equal to or larger than the size of the result buffer then the buffer is “empty” and generate() must be called to produce new results.

source

pub fn reset(&mut self)

Reset the number of available results. This will force a new set of results to be generated on next use.

source

pub fn generate_and_set(&mut self, index: usize)

Generate a new set of results immediately, setting the index to the given value.

Trait Implementations§

source§

impl<R: Clone + BlockRngCore + ?Sized> Clone for BlockRng64<R>where R::Results: Clone,

source§

fn clone(&self) -> BlockRng64<R>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl<R: BlockRngCore + Debug> Debug for BlockRng64<R>

source§

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
source§

impl<R: BlockRngCore<Item = u64>> RngCore for BlockRng64<R>where <R as BlockRngCore>::Results: AsRef<[u64]> + AsMut<[u64]>,

source§

fn next_u32(&mut self) -> u32

Return the next random u32. Read more
source§

fn next_u64(&mut self) -> u64

Return the next random u64. Read more
source§

fn fill_bytes(&mut self, dest: &mut [u8])

Fill dest with random data. Read more
source§

fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>

Fill dest entirely with random data. Read more
source§

impl<R: BlockRngCore + SeedableRng> SeedableRng for BlockRng64<R>

§

type Seed = <R as SeedableRng>::Seed

Seed type, which is restricted to types mutably-dereferenceable as u8 arrays (we recommend [u8; N] for some N). Read more
source§

fn from_seed(seed: Self::Seed) -> Self

Create a new PRNG using the given seed. Read more
source§

fn seed_from_u64(seed: u64) -> Self

Create a new PRNG using a u64 seed. Read more
source§

fn from_rng<S: RngCore>(rng: S) -> Result<Self, Error>

Create a new PRNG seeded from another Rng. Read more
source§

fn from_entropy() -> Self

Creates a new instance of the RNG seeded via getrandom. Read more

Auto Trait Implementations§

§

impl<R: ?Sized> RefUnwindSafe for BlockRng64<R>where R: RefUnwindSafe, <R as BlockRngCore>::Results: RefUnwindSafe,

§

impl<R: ?Sized> Send for BlockRng64<R>where R: Send, <R as BlockRngCore>::Results: Send,

§

impl<R: ?Sized> Sync for BlockRng64<R>where R: Sync, <R as BlockRngCore>::Results: Sync,

§

impl<R: ?Sized> Unpin for BlockRng64<R>where R: Unpin, <R as BlockRngCore>::Results: Unpin,

§

impl<R: ?Sized> UnwindSafe for BlockRng64<R>where R: UnwindSafe, <R as BlockRngCore>::Results: UnwindSafe,

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for Twhere T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.